Northern Lights Glass offers a full, comprehensive 10 year warranty on each of our door inserts, sidelites, transoms, or fixed window designs. Our warranty covers each unit against any type of seal failure or condensation between the sealed panes of glass. If a product ever shows signs of seal failure, we will replace it at no cost to you. We would cover any expense incurred such as delivery, installation, or material required to perform the work. We truly stand behind the quality of our entire product line and offer a solid warranty for those very rare cases where an insert simply has to be replaced.